Self-modulating spectrometer

Details Self-modulating spectrometer Self-modulating spectrometer

1981-08-27

1984-04-10

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

250373, G01J 342

Patent

active

044418159

ABSTRACT:
A wavelength-modulated derivative spectrometer is disclosed which enables continuous measurement of trace amounts of NH.sub.3 in stack gas which includes a high concentration of SO.sub.2, and which in general enables measurement of low amounts of a substance having a relatively broad-band absorption spectrum present in a gas together with a high concentration of a substance having a relatively narrow-band periodic spectrum structure, with interference resulting from the latter substance being substantially eliminated.

REFERENCES:
Izumi et al., Analytical Chemistry, vol. 53, No. 6, May 1981, pp. 782-786.

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